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3 years ago

Lance armstrong biking over 40 miles in one day would be considered muscular strength. true or false

Physics

1 answer:

Sonja [21]3 years ago

4 0

True.

Reason:

Muscular strength is the maximum force exerted by a muscle against some form of resistance.

In this example, lance Armstrong is continuously working against the gravitational force. Thus, it can be considered as muscular strength.

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A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 5 m from the bulb,

beks73 [17]

Answer:

a) 0.477 W/m²

b) 13.407 N/C

c) 18.96 N/C

Explanation:

P = Power = 150 W

r = Distance = 5 m

ε₀ = Permittivity of space = 8.854×10⁻¹² F/m

a) Average intensity

$\bar{S}=\frac{P}{A}\\\Rightarrow \bar{S}=\frac{150}{4\pi r^2}\\\Rightarrow \bar{S}=\frac{150}{4\pi 5^2}\\\Rightarrow \bar{S}=0.477\ W/m^2$

∴ Average intensity is 0.477 W/m²

b) Rms value

$\bar{S}=c\epsilon_0E_{rms}^2\\\Rightarrow E_{rms}=\sqrt{\frac{\bar{S}}{c\epsilon_0}}\\\Rightarrow E_{rms}=\sqrt{\frac{\bar{0.477}}{3\times 10^8\times 8.854\times 10^{-12}}}\\\Rightarrow E_{rms}=13.407\ N/C$

∴ Rms value of the electric field is 13.407 N/C

c) Peak value

$E_0=\sqrt 2E_{rms}\\\Rightarrow E_0=\sqrt 2\times 13.407\\\Rightarrow E_0=18.96\ N/C$

∴ Peak value of the electric field is 18.96 N/C

8 0

3 years ago

What is the formula for power that uses volts and amps?

kvasek [131]

Answer:

P = VI

...............

5 0

4 years ago

What is the unit for height

juin [17]

The unit of height is:
Feet
Inches
Centimeters

5 0

3 years ago

Read 2 more answers

Suppose you are taking a walk one day when you see a tree branch snap at its base and begin to rotate downward with the break ne

Naya [18.7K]

Answer:

α = 3.27 rad/s²

Explanation:

Given that

L= 3 m

Lets take mass of tree = m kg

The torque to mass m = m g .L

The mass moment of inertia of tree ,I

I = mL² kg.m²

We know that

τ = I α

m g .L = mL² .α

α= g/L

Now by putting the value

$\alpha =\dfrac{ 9.81}{ 3}\ rad/s^2$

α = 3.27 rad/s²

No we can find the mass of the from the above information because angular acceleration is not depend on the mass of tree.

6 0

4 years ago

How to detect an acid / base?

kirill115 [55]

<u>ACID</u>

Litmus Test- Blue litmus paper turns red in acidic medium.
pH test- Dip a pH paper into the solution. And check for the corresponding values on the pH scale for the colours that appear. If the value is below 7, its acidic

<u>BASE</u>

Litmus Test- red litmus paper turns blue in basic medium.
pH test - Dip a pH paper into the solution. And check for the corresponding values on the pH scale for the colours that appear,if it's above 7, it's basic.

3 0

4 years ago